LAKE BUENA VISTA, Fla.—Justin Upton had barely cleared the left-field fence with a high fly that he didn’t think was going out when he said, “What are we playing on, a high school field?”

Of course not. This was one of the back fields at the Atlanta Braves’ spring training complex at Disney’s Wide World of Sports. But don’t blame Upton for wondering.

Justin and B.J. Upton will play together in the Braves' outfield. (AP Photo)

After all, he was practicing on the same field as his brother, B.J. Upton, and the last time that happened, they were in high school in Chesapeake, Va., playing fall ball.

And here they were, 12 years later, taking turns blasting BP homers for the Braves. Three weeks after Justin was traded to Atlanta and 2 1/2 months after B.J. signed there as a free agent, the brothers were able to check off another “first” on their big-league bucket list Friday.

This was their first official workout as members of the Braves, which followed their first time seeing their lockers side by side, their first team meeting and first unofficial workout.

No wonder the brothers didn’t consider the first workout as a very big deal. B.J., in fact, considered it so routine that he skipped out on a group of reporters and left little brother to handle the interviews.

“We were in camp early and got that (first workout) out of the way the other day,” Justin said, before realizing this was the first time they were wearing Braves uniforms on an actual field. “That was pretty cool.”

What must also have been cool was to walk into the spring clubhouse earlier this week and see their lockers side by side. Such a sight is not common in the major leagues. Justin isn’t sure they will have adjoining lockers in Atlanta, either.

“We’re trying it out,” he said. “They asked us a few weeks ago if we would be able to tolerate each other all spring. It may not last for the season.”

Though they have no plans to room together during spring training or during the season, they will be seeing more of each other this year than they have since B.J. graduated from high school in 2002. The only time they have even seen each other during a baseball season was during interleague play in 2010.

Now they’re teammates who, along with Jason Heyward, will form one of baseball’s top outfields while pushing each other to new heights in careers that, so far, have been very good but still not quite up to the expectations that come with being the first pick in the draft (Justin, 2005) or the second (B.J., 2002).